<style>
    .modal-header{
        border-top-left-radius: 5px;
        border-top-right-radius: 5px;
    }
</style>
<div id="popup_khachhang" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel" aria-hidden="true">
      <div class="modal-dialog modal-lg" style="width: 1200px;">
        <div class="modal-content">
            <div class="modal-header bg-primary">
                <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                <h4 class="modal-title" id="modal_label">Chi tiết khách hàng</h4>
            </div>
            <div class="modal-body" id="modal_content">
              
             </div>
        </div>
      </div>
    </div>